Compare to Women's Rogaine active ingredient. Up&Up Hair Regrowth Treatment For Women, Minoxidil Topical Solution 2 Percent contains minoxidil, the Number 1 dermatologist recommended active ingredient for hair regrowth (of U.S. physicians surveyed by an independent market research firm). Minoxidil works beneath the surface to reactivate hair follicles to stimulate hair regrowth on top of the scalp. Made for women who have a general thinning of hair on the top of the scalp. Unscented.